Grain-separating screen



(No Model.)

0. GLOSZ.

GRAIN SEPAR'ATING SCREEN.

Patented July 14, 1891.

0 8 M T I W UNITED: STATES.

PATENT 7 OFFICE.

CHARLES cLosZ, or sr. ANsc R, 10W

GRAIN-SEPARATING SCREEN. v

SPECIFICATION forming part of Letters Patent No.455,998, dated uly 14,1891.

Application filed January 20, 1891 Serial No. 378,445 (No model.) I

To .aZZ whom, it may concern.- Be it known that 1, CHARLES OLosz, acitizen of the United States, residing at St. Ansgar, in the county ofMitchell and State of Iowa, have invented new and useful Improvements inGrain-Separating Screens, of which the following is a specification.

My invention relates to improvements in shaking screens forgrain-separators, and particularly of the corrugated sheet-metal plat-.form construction shown and described in my patents Nos. 434,246,434,247, 434,248, and 434,249, dated August 12, 1890; and the object ofmy present improvement is to provide a better cleaning and separatingsurface; to cause the long stuff to pass off more freely and to preventits catching in the openings, and to facilitate the construction of suchplatform.

The particularimprovement I will specifically point out in the claimsconcluding this specification,in connection with the accompanyingdrawings, in which- Figure 1 is a top View of my improvedplatform-shaking screen. Fig. 2 is a longitudinal section of the same.Figs. 3 and 4 show in top view and longitudinal section so much of mysaid patented screen as illustrates the difference of constructionbetween it and my present improvement. Fig. 5 is a bottom view of myimproved shaking screen. Fig. 6 is a cross-section of the same, and Fig.7 shows a cross-section taken at one of the openings, looking toward theraised spearpointed edge of said opening to illustrate its enlargedmiddle part.

It is deemed unnecessary to show the plat form-separator as applied foruse in an organized machine, as it will be understood by those usingsuch machine that the grain to be separated is delivered from a suitablehopper or conveyer upon the inner end A of the platform, and that thelatter is connected to a suitable device forgiving it alongitudinally-reciprocatin g movement, and that the platform for thispurpose may be suspended from the frame of the machine or supported uponfixed ways of the frame, and that it may be made adjustable to inclineit downward toward the discharge end for the, passage of the straw andlong stufi therefrom, as may be required in use. The separator-platformis of sheet metal, of theproper width and length to suit the machine inwhich it may be intended for use.

In Figs. 3 and 4 the openings are shown as having approximate heartshape, forming spear-points 2, standingwithin the openings toward the'discharge end of the platform, the metal being cut out to form the openings, and thereby presenting an edge under which a bearded head of grainwould be liable to catch. 2

Referring to Figs. 1, 2, 5, and 6, the openings are shown as being madeby acut, so as to form the upper spear-point 2 and the under dividedlobes 6 6, and it is this construction which constitutes my presentimprovement, asI will now more particularly describe.

The platform is provided with corrugations a, which extend in parallelrelation to the length of the platform and at such height and distanceapart as to form channels for the passage of the matters to beseparated. Across these channels and at suitable distances apart theopenings are formed, and they extend from the base of one corrugation tothe other, the spear-point of each standing toward the delivery end inthe middle ofthe opening and forming on each side deep concave edges 33, which terminate at the base of the corrugations on a plane with thesurface. Asurfaceridge 4-extends from the spear-point on a downwardincline toward the receiving end and terminates at the point 7 of thecut, forming the surfaces 5 5, inclining from the spearpoint downwardtoward the opening and toward the corrugations, as seen in Fig. 6, andsuch construction is identical with that set out in my said patents. Theother or forward side of the cut is bent downward, and being thecounterpart of the spear-point-forming edge forms two convex-edged lobes6 6 and a middle meeting space 7 between the lobes, so that the surfacesof the platform along the corrugations will be on a plane terminating inthe lobes. These lobes stand inclined downward toward the receiving endof the platform and make that part of the opening between thespear-point and the dividingpoint of the lobes the largest or widest. Itis this peculiar underturned formation of the openings, which I havefound. to co-operate with the raised spear-point formation, to give thesurest feed of the long stuff over the openings and to prevent thechoking of the platform. The inclination of these underturned lobes isabout sixty degrees, and they are formed in the operation of stampingout the platform by dies. I

Looking at Fig. 3, which shows the openings of my patented screen, at bis seen a bearded head of grain with its beards liable to catch underthe edge of the opening as it is moved forward under the reciprocatingmovement of the screen. At 0 and dare also seen pieces of sticks ornails as liable to catch under the edges, while at e a large grain ofcorn is seen as lodged across the opening at the spear-point.

Looking at Fig. 1, which shows my improvement, at f are seen a beardedhead of grain and sticks or nails passing off over the openings and overthe underturned lobes without hinderance, while at g is seen a largegrain of corn passing through the largest part of the opening under thespear-point. The provision of the divided turned-clown lobes gives abetter effect to the. air-blast, as seen in Fig. 2, in its upward forcethrough the openings, because the blast striking the lobes under thespear-point is turned more directly upward on each side of thespear-point, and lifts-the light stuff as it passes over the openingsand cleans out the light stuff more effectively.

In Fig. 4 the blast is more in a straight line and does not act sothoroughly. In Fig. 3 the opening is the largest at its rounded ends,while in Fig. 1 the openings are largest under the spear-points andsmallest along the corrugations where nearly all the long stuff travels,and. is therefore much better adapted forremoving such stuff from thegrain. The length of the spear-points will govern the length of theunderturned lobes, and the pitch of the latter will be regulatedaccording' to their length. The surface feed and dividing function ofthe spear-points is supplemented and made more complete by the sideunderturned lobes or lips to give effective shaking, and separation tothe stuff to be carried off andfree escape of the grain throughthe-openings.

It will be seen that the separating action of the screen-surface causesboth the grain and heavy longstuff to collect along the walls of thecorrugations, and as the ends of the openings are only made large enoughtopermit the grain to pass freely through them substances larger thanthe grain would be liable to lodge in and obstruct the openings at thesepoints; but by making the openings largest under the spear-points suchsubstances larger than the grain will work toward the spearpoints andpass out, as seen at g in Fig. 1. A sectional diagram, taken on the line1 1 of Fig.2, showing this form of the opening, is seen in Fig. 7; andit will be understood that it is the relation of the underturnedlip-lobes to the curved ends of the openings that makes that part of theopening smallerthan that part under the spear-point wherethe lip-lobesmeet, so that the larger substances would pass out in the space betweenthe underturned lip-lobes, and thus prevent the lodgment of obstructionsin the ends of the openings.

I have stated that the openings are formed by a line out, and that theupper spear-point edge and the under lobe-turned edges are of coincidentcontour, and this is the construction I prefer; but it is obvious thatthe underturned lobe-lips may be of different form as to their edgecontour so long as the construction embraces the forward overhangingspear-points and the rearward underhanging lobe-lips divided in the lineof the spearpoints.

I claim as my improvement- 1. A screen for grain-separators,constructedof a sheet-metal platform, corrugated and having openings standingcrosswise, bounded by forward overhanging spear-points and by rearwardunderhanging lobe-lips divided in the line of the overhangingspear-points, for the purpose stated.

2. A screen for grain-separators,constructed of a sheet-metal platform,corrugated and having openings standing crosswise, bounded byoverhanging spear-points and by underhanging lobe-like lips, the saidprojecting parts standing in: opposite directions and having coincidentcontour, for the purpose stated.

In testimony whereof I have hereunto set my hand in the prcsenceof twosubscribing witnesses.

CHAS. CLOSZ.

Witnesses:

MARTIN Mon, N. LORENZEN.

